The eigenspaces of twisted polynomials over cyclic field extensions

Let $K$ be a field and $σ$ an automorphism of $K$ of order $n$.Employing a nonassociative algebra, we study the eigenspace of a bounded skew polynomial $f\in K[t;σ]$. We mainly treat the case that $K/F$ is a cyclic field extension of degree $n$ with Galois group generated by $σ$. We obtain lower bounds on the dimension of the eigenspace, and compute it in special cases as a quotient algebra. Conditions under which a monic polynomial $f\in F[t]\subset K[t;σ]$ is reducible are obtained in special cases.

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